GNU Linux-libre 4.9.328-gnu1
[releases.git] / drivers / nvdimm / e820.c
1 /*
2  * Copyright (c) 2015, Christoph Hellwig.
3  * Copyright (c) 2015, Intel Corporation.
4  */
5 #include <linux/platform_device.h>
6 #include <linux/memory_hotplug.h>
7 #include <linux/libnvdimm.h>
8 #include <linux/module.h>
9
10 static const struct attribute_group *e820_pmem_attribute_groups[] = {
11         &nvdimm_bus_attribute_group,
12         NULL,
13 };
14
15 static const struct attribute_group *e820_pmem_region_attribute_groups[] = {
16         &nd_region_attribute_group,
17         &nd_device_attribute_group,
18         NULL,
19 };
20
21 static int e820_pmem_remove(struct platform_device *pdev)
22 {
23         struct nvdimm_bus *nvdimm_bus = platform_get_drvdata(pdev);
24
25         nvdimm_bus_unregister(nvdimm_bus);
26         return 0;
27 }
28
29 #ifdef CONFIG_MEMORY_HOTPLUG
30 static int e820_range_to_nid(resource_size_t addr)
31 {
32         return memory_add_physaddr_to_nid(addr);
33 }
34 #else
35 static int e820_range_to_nid(resource_size_t addr)
36 {
37         return NUMA_NO_NODE;
38 }
39 #endif
40
41 static int e820_pmem_probe(struct platform_device *pdev)
42 {
43         static struct nvdimm_bus_descriptor nd_desc;
44         struct device *dev = &pdev->dev;
45         struct nvdimm_bus *nvdimm_bus;
46         struct resource *p;
47
48         nd_desc.attr_groups = e820_pmem_attribute_groups;
49         nd_desc.provider_name = "e820";
50         nd_desc.module = THIS_MODULE;
51         nvdimm_bus = nvdimm_bus_register(dev, &nd_desc);
52         if (!nvdimm_bus)
53                 goto err;
54         platform_set_drvdata(pdev, nvdimm_bus);
55
56         for (p = iomem_resource.child; p ; p = p->sibling) {
57                 struct nd_region_desc ndr_desc;
58
59                 if (p->desc != IORES_DESC_PERSISTENT_MEMORY_LEGACY)
60                         continue;
61
62                 memset(&ndr_desc, 0, sizeof(ndr_desc));
63                 ndr_desc.res = p;
64                 ndr_desc.attr_groups = e820_pmem_region_attribute_groups;
65                 ndr_desc.numa_node = e820_range_to_nid(p->start);
66                 set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags);
67                 if (!nvdimm_pmem_region_create(nvdimm_bus, &ndr_desc))
68                         goto err;
69         }
70
71         return 0;
72
73  err:
74         nvdimm_bus_unregister(nvdimm_bus);
75         dev_err(dev, "failed to register legacy persistent memory ranges\n");
76         return -ENXIO;
77 }
78
79 static struct platform_driver e820_pmem_driver = {
80         .probe = e820_pmem_probe,
81         .remove = e820_pmem_remove,
82         .driver = {
83                 .name = "e820_pmem",
84         },
85 };
86
87 static __init int e820_pmem_init(void)
88 {
89         return platform_driver_register(&e820_pmem_driver);
90 }
91
92 static __exit void e820_pmem_exit(void)
93 {
94         platform_driver_unregister(&e820_pmem_driver);
95 }
96
97 MODULE_ALIAS("platform:e820_pmem*");
98 MODULE_LICENSE("GPL v2");
99 MODULE_AUTHOR("Intel Corporation");
100 module_init(e820_pmem_init);
101 module_exit(e820_pmem_exit);